San Francisco 49ers' Kwon Alexander (56) and Emmanuel Moseley (41) celebrate Richard Sherman's interception on a pass intended to Green Bay Packers' Davante Adams (17) in the last two minutes of the fourth quarter of their NFC Championship game at Levi's Stadium in Santa Clara, Calif., on Sunday, Jan. 19, 2020. 49ers won 37-20.(Ray Chavez/Bay Area News Group)

San Francisco 49ers players celebrate with Richard Sherman (25) after he intercepted a pass by Green Bay Packers quarterback Aaron Rodgers (12) in the fourth quarter of their NFC Championship game at Levi's Stadium in Santa Clara, Calif., on Sunday, Jan. 19, 2020. The San Francisco 49ers defeated the Green Bay Packers 37-20. (Jose Carlos Fajardo/Bay Area News Group)

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Richard Sherman is known to feed off bulletin board material.

Just as he and the 49ers were putting the finishing touches on a 37-20 NFC Championship win over the Packers to clinch their place in the Super Bowl, a voice called out in the darkness offering him a bite.

Darrelle Revis, a seven-time Pro Bowl cornerback in his own right, called into question Sherman’s courage. He was so proud of his idea that he put it on Instagram AND on Twitter, just to be sure his take was heard.

“Fear of getting beat in man to man coverage. Every snap every play,” Revis tweeted, along with an image of Sherman covering Green Bay’s Davante Adams. “The fact that he doesn’t travel as a cornerback is lame. (Accept) the challenge as the best and shut Adams down the entire game. Do it for the game of football. Stop hiding (in) a cover 3 zone.”

Revis tried to backpedal like he did so well for many years as a corner, but it was too late.

For reference, Revis and Sherman both have three career playoff interceptions. Neither had one in Super Bowl XLIX, when Revis’ Patriots beat Sherman’s Seahawks, but that game could be the genesis for this animosity.

They’re also tied in Super Bowl rings with one each, but Sherman will have the chance to take the lead in two weeks.

Given the mentality of both guys, somehow it doesn’t seem either will admit defeat in this war of words.